虽然，那琴鼓和琴弦早已经破败而折断，却让我久久流连，感叹着“折戟沉沙铁未销，自将磨洗认前朝”。
Although those drum and strings have dilapidated and broken, but let me linger on it for a long long time, and sighed with emotion, "forays iron not pins, since will confess mostly remaining."
以聚合硫酸铁辅以活性白土为絮凝剂处理洗羊毛污水。
The treatment of waste washed wool water with polymeric iron sulfate and activated clay as flocculating agent was studied in this article.
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